Biological E. Limited offers Inactivated Polio Vaccine [Erapol]. Biological E. Limited offers various types of vaccines like Tetanus vaccine, Hepatitis B vaccine etc and preventive medicines. The Inactivated Polio Vaccine [Erapol] is used to provide immunization against polio. The Inactivated Polio Vaccine [Erapol] is available in 0.5ml vial pack or 5ml vial pack.